Calculating device.



R. F. KOSTER.

CALGULATING DEVICE. I APPLICATION FILED JANA, 1909.

1,005,560. L Patented oet. 10,1911.y

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ROY FL KOSTERTOF iOS ANGELES, CALIFORNIA.

CALCULATING DEVICE.

To all whom it may concern:

Be it known that I, Roi' F. Kosten. a

citizen ot the United States, residing at Los with less mental calculation than can be done with the usual slide rule. y

Another object ot the invention is to provide means whereby a large mnnber of dit'- terent formul can be worked out on the same slide rule by the use of separable supplementary devices, each corresponding to a given formula or set of formulzc.

Other objects of the invention will appear hereinafter.

The accompanying drawings illustrate the invention and referring' thereto: Figure 1 vis a perspective of the slide rule with the supplementary device or attachment slip in place thereon. Fig. 2 is a transverse section. Fig. 3. is an inverted plan of the supplementary strip. Fig. -1 is a diagram or chart of instructions for the use of the device. 4

1 designates-the body of a slide rule which is provided on its upper face with the usual upper and lower scales 2, 3, the said body vbeing grooved between said scales to receive and guide the slide member 4 which is provided With upper and lower scales 5, 6 reading respectively7 on the scales 2, 3, all of said scales being logarithmic so as to provide for` the operations of multiplication and division by setting of the slide in the well known manner.

8 designates the cursor which slides over the body memberA 1 and. 'is lguidedthereon 5 by engaging in the usual grooves 9 in said body member, said cursorhaving the usual hair-line 10 for reading on the scales.

The supplementary device or attachment.

which constitutes the particular feature of my invention consists ot a strip of suitable material, for example, Celluloid, which is of such width and thickness that it can be slipped underthe cursor and retained thereby in nosition on the slide rule. Said strip is 4preferably of suchtI width that when one edge thereof is brought to register with Application filed January 4. 1909.

Specification of Letters Patent. Patellt'd @CL 10, 1911.

Serial No. 476,718.

anedge otthe slide rule body the other edge (it the strip will not cover the scale near the other edge ot the slide'rule body, sol

that either the lower or the upper scale on the.l slide. rule'body may be read with refer ence to the marks on the supplementary strlp. The said marks on the supplementary strip are arranged in accordance with with the formula tor flow ot water in pipes,

the supplementary strip shown in drawings being marked for that formula. Near the lower edge of said strip three scales 13, 14C, 15 are marked. each of these' scales being logaritlnnic and corresponding t0 definite diameters'of pipes in inches` for example inches. l inches-` etc., up to 30 inches. The successivev scales 13, 14e, 15 readingto successively larger diameters and 4forming in effect a single scale of three times the length, it being understood that in reading on the second scale the reading is multiplied by ten compared with the reading on the first scale, and reading on the third scale 15 the reading is multiplied b v 100, this diti ference in reading being indicated by the marks :m1, mail' on the respective scales. Assume now that it is desired to ascertain the number of miners inches which will How inthe vgiven length, say 1200 feet. ot pipe of a given diameter, say 10.inches, under a given head, say 2 feet. The slide 4 is set with its upper scale 5 to the reading 1200 with reference to 1 (the leftindex) on t-he upper fixed scale 2. The slip or supplementary strip 1'2 -is. then set to a head, namely 2,

case is that of only a separate operation.

.Moreover, having set the slide 4 to a given the miners inches for any size of p-ipe can 'be read 0H by simply'setting the cursor.

Other vdata may also bev indicated at the same time, for example I have shown the supplementary strip 12 provided With Windows, or openings adapted to read on one of the scales of the slide 4, say the upper scale 5. When the lefthand end of the strip 4 is set to a head, as indicated on the said upper scale 5, the index mark 19 at said openings 19, 19 Will read the pounds per square inch on the said upper scale. Thus, if an engineer is Working in terms of ounds per square'inch rather than terms o head, he will use these marks 19 instead of the end of the strip, or, if`desired, he can translate square inch by this expedient.

from terms of head to terms of pounds per Other marks may also rbe provided on the scale, for example, along the upper edge may be provided an index .denoting velocity, and another index n denoting miners? inches, and a series of other marks representing gallons in different intervals of time, so that when any one of these marks is set to a given figure on the upper fixed scale 2 the corresponding quantity may be read from the other marks on the said upper scale. The back of the slip may also'be provided with marks as shown in Fig. 3 corresponding to another formula or set of formulae.

In practice it is preferred to provide a set or plurality of slips 12, each provided with marks represent-ing al definite formula or set of formulae, thus each slip may provide for a formula in general use by an engineer in any one branch, there being, for exam le a sllp for hydraulic engineering, a slip ir steam engineering, one for electric wiring, etc., all of the slips being interchangeable land reading insertible beneath the cursor or removable therefrom, so that' with. a set of slips on hand it is but the Work of a moment to insert the proper slip ,and the 'slip vvhen inserted not only takes the place of the cumbersome 'table of for "mul, but enablesthe operation to be performed without mental effort. If desired, a chart or diagram of instructions can be issued with each slip or set of slips, as

' member.

shown in Fig. 3, the chart indicated at 22 in said ligure corresponding to the slip shown in Fig. 3.

lVhat I claim is:

l. A calculating device comprising abody member provided with a logarithmlc scale, a slide member mounted to slide on sa'id body memberand provided with a logarithmic scale reading with reference to the aforesaid scale, a cursor mountedto slide on said body member, and a strip mounted to slide over said body member and slide member and between' said cursor and said body member and having portions thereof adapted to read on said slide member or on the body member, the said strip being of a width less than the cursor so as. to expose the aforesaid scale on the body member.

2. A calculating device comprising a body memberv provided with two logarithmic scales, a slide member mounted to slide on said body member and also provided With two logarithmic scales reading With reference to the aforesaidscales, a cursor mounted to slide on said body member, and a strip mounted to slide between the cursor and the said body member and having portions thereof adapted to read on said slide member or on the body member, the ysaid strip being of such Width as"to expose one of t-he scales on the body member.

3. A calculating device comprising a body member provided with tWol logarithmic scales, a slide member mounted to slide on said body7 member and also provided with two logarithmic scales reading with reference to the aforesaid scales, a cursor mounted to slide on said body member, and a removable strip mounted to slide between the cursor and the said body member and having portions thereof adapted to read on said slide member or on the body member, the said removable strip being of such Width as to expose one of the scales on the body 'In testimony whereof, I have hereunto set my hand at Los Angeles, California, this 26th day of December, 1908.-

RoY r. KosTER.

In presence of ARTHUR P. KNIGHT, FRANK L. A. GlRAHAM. 

